java Explication détaillée de l'utilisation des instances HttpSessionListener et Filter dans Jetty9

class MyHttpSessionListener implements HttpSessionListener { 
  @Override 
  public void sessionCreated(HttpSessionEvent httpSessionEvent) { 
    System.out.println("sessionCreated"); 
  } 
 
  @Override 
  public void sessionDestroyed(HttpSessionEvent httpSessionEvent) { 
    System.out.println("sessionDestroyed"); 
  } 
}

ServletContextHandler.getSessionHandler().addEventListener(new MyHttpSessionListener());

class MyFilter implements Filter { 
 
  public MyFilter() { 
 
  } 
 
  @Override 
  public void init(FilterConfig filterConfig) throws ServletException { 
 
  } 
 
  @Override 
  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { 
    if (servletRequest instanceof HttpServletRequest) { 
      HttpServletRequest httpRequest = (HttpServletRequest) servletRequest; 
 
      System.out.println(httpRequest.getServletPath()); 
    } 
    filterChain.doFilter(servletRequest, servletResponse); 
  } 
 
  @Override 
  public void destroy() { 
 
  } 
}

ServletContextHandler.addFilter(new FilterHolder(new MyFilter()), "/*", EnumSet.allOf(DispatcherType.class));